I have planed of changing to WVO this summer when I can afford it. I hav thought about using the exhaust for heating. I have not thought about wrapping some tubing around the exhaust. Thanks for that post. I have the 1988 F-250 XLT Lariet with the 7.3 nonturbo and I was wondering if anyone knows if I need to upgrade the fuel lines for the heat of the WVO passing through. If you can help, thanks.